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Data Sheet

AD9531

Registers for PLL2 Group 2B Outputs, OUT2_2x to OUT2_4x—Register 0x0208 to Register 0x020B

Table 65. PLL2 Group 2B Outputs Register Details

Address

Bits

Bit Name

Description

0x0208

[D7:D0]

D2B [7:0]

D2B divider Bit D7 (MSB) to Bit D0 (LSB). The divide factor is the value of D2B [7:0] + 1. D2B powers

down when all four of the associated output drivers power down whether via the power-down bit

or via the logic mode bits.

0x0209

[D7:D6]

Unused

Unused.

[D5:D3]

Logic mode [2:0]

Configure OUT2_2x output driver as follows:

000: disabled.

001: HSTL.

010: undefined.

011: undefined.

100: 1.8 V CMOS, OUT2_2P active, OUT2_2N active.

101: 1.8 V CMOS, OUT2_2P active, OUT2_2N disabled.

110: 1.8 V CMOS, OUT2_2P disabled, OUT2_2N active.

111: undefined.

[D2:D1]

Polarity [1:0]

Configure OUT2_2x polarity as follows (applies to CMOS only):

00: OUT2_2P normal, OUT2_2N inverted.

01: OUT2_2P normal, OUT2_2N normal.

10: OUT2_2P inverted, OUT2_2N inverted.

11: OUT2_2P inverted, OUT2_2N normal.

Power-down

0: OUT2_2x driver active.

1: OUT2_2x driver powered down.

0x020A

[D7:D6]

Unused

Unused.

[D5:D3]

Logic mode [2:0]

Configure the OUT2_3x output driver as follows:

000: disabled.

001: HSTL.

010: undefined.

011: undefined.

100: 1.8 V CMOS, OUT2_3P active, OUT2_3N active.

101: 1.8 V CMOS, OUT2_3P active, OUT2_3N disabled.

110: 1.8 V CMOS, OUT2_3P disabled, OUT2_3N active.

111: undefined.

[D2:D1]

Polarity [1:0]

Configure OUT2_3x polarity as follows (applies to CMOS only):

00: OUT2_3P normal, OUT2_3N inverted.

01: OUT2_3P normal, OUT2_3N normal.

10: OUT2_3P inverted, OUT2_3N inverted.

11: OUT2_3P inverted, OUT2_3N normal.

Power-down

0: OUT2_3x driver active.

1: OUT2_3x driver powered down.

0x020B

[D7:D6]

Unused

Unused.

[D5:D3]

Logic mode [2:0]

Configure the OUT2_4x output driver as follows:

000: disabled.

001: HSTL.

010: undefined.

011: undefined.

100: 1.8 V CMOS, OUT2_4P active, OUT2_4N active.

101: 1.8 V CMOS, OUT2_4P active, OUT2_4N disabled.

110: 1.8 V CMOS, OUT2_4P disabled, OUT2_4N active.

111: undefined.

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